An SMD crystal oscillator can affect battery life because its ESR (Equivalent Series Resistance) value and its settling behaviour help determine the power requirements of the oscillator circuit. A low-impedance quartz crystal that stabilises reliably supports stable and efficient clocking, whilst an unsuitably selected crystal can lead to longer start-up times, higher current consumption or unstable operation.
In battery-powered devices, every microampere counts. Smart meters, IoT sensors, wearables, wireless modules, medical devices and industrial sensors often have to operate on a single battery for years. The oscillator circuit is a small but important part of the overall system.
If a crystal takes a long time to stabilise, the circuit requires more reserve capacity, more time or more energy. Furthermore, data may not be transmitted within the defined duty cycle, meaning that radio transmissions may even have to be repeated. If, on the other hand, a crystal starts up reliably with low ESR, the design can be optimised for greater efficiency. Particularly in wake-up cycles, sleep modes and periodic radio communication, a stable clock source that stabilises very quickly can contribute to energy optimisation.
The exclusiveLRT crystal oscillatorsfrom PETERMANN-TECHNIK provide a great deal of additional reliability thanks to their very low resistance. The low-resistance resonator design reduces the load on the oscillator circuit. This stabilises the start-up process and considerably reduces the settling time, resulting in lower power requirements for the circuit, which significantly reduces the circuit’s current consumption and thus extends battery life.
The followingLRT crystal oscillatorsare recommended by the specialists at PETERMANN-TECHNIK for radio applications:
MHz crystal from the SMD03025/4 series (3.2 x 2.5 mm/4-pad)
MHz crystal from the SMD02016/4 series (2.0 x 1.6 mm/4-pad)
MHz crystal from the SMD01612/4 series (1.6 x 1.2 mm/4-pad)
kHz crystal from the M3215RR series, 50 kOhm version (3.2 x 1.5 mm/2-pad)
>>> Back to the FAQs <<<
